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6.34 Write Sector(s) (30h)
This command writes from 1 to 256 sectors as specified in the Sector Count Register. A sector count of zero
requests 256 sectors. The transfer begins at the sector specified in the Sector Number Register. When this
command is accepted, the Drive sets BSY, sets DRQ and clears BSY, then waits for the host to fill the sector buffer
with the data to be written. No interrupt is generated to start the first host transfer operation. No data should
be transferred by the host until BSY has been cleared by the host.
For multiple sectors, after the first sector of data is in the buffer, BSY will be set and DRQ will be cleared. After
the next buffer is ready for data, BSY is cleared, DRQ is set and an interrupt is generated. When the final sector
of data is transferred, BSY is set and DRQ is cleared. It will remain in this state until the command is completed
at which time BSY is cleared and an interrupt is generated. If an error occurs during a write of more than one
sector, writing terminates at the sector where the error occurred. The Command Block Registers contain the
cylinder, head and sector number of the sector where the error occurred. The host may then read the command
block to determine what error has occurred, and on which sector. Table 58 defines the Write Sector(s) command
Byte sequence.
Table 58: Write Sector(s)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
30h
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27-24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23-16)
Cylinder Low (LBA15-8)
Sector number (LBA7-0)
Sector Count
nu
6.35 Write Sector(s) without Erase (38h)
This command is similar to the Write Sector(s) command with the exception that an implied erase before write
operation is not performed. This command has the same protocol as the Write Sector(s) command. The sectors
should be pre-erased with the Erase Sector(s) command before this command is issued. If the sector is not pre-
erased a normal write sector operation will occur. Table 59 defines the Write Sector(s) without Erase command
Byte sequence.
Table 59: Write Sector(s) without Erase
Task File Register
7
6
5
4
3
2
1
0
COMMAND
38h
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27-24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23-16)
Cylinder Low (LBA15-8)
Sector number (LBA7-0)
Sector Count
nu
Swissbit AG
Industriestrasse 4-8
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.2
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
X-200_data_sheet_SA-QxBR_Rev12.doc
Page 34 of 47
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